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towlower(3)


NAME

   towlower, towlower_l - convert a wide character to lowercase

SYNOPSIS

   #include <wctype.h>

   wint_t towlower(wint_t wc);

   wint_t towlower_l(wint_t wc, locale_t locale);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

   towlower_l():
       Since glibc 2.10:
              _XOPEN_SOURCE >= 700
       Before glibc 2.10:
              _GNU_SOURCE

DESCRIPTION

   The  towlower()  function  is  the  wide-character  equivalent  of  the
   tolower(3) function.  If wc is an uppercase wide character,  and  there
   exists  a  lowercase  equivalent  in the current locale, it returns the
   lowercase equivalent of  wc.   In  all  other  cases,  wc  is  returned
   unchanged.

   The  towlower_l()  function  performs  the  same task, but performs the
   conversion based on  the  character  type  information  in  the  locale
   specified  by  locale.   The  behavior  of towlower_l() is undefined if
   locale is the special locale object LC_GLOBAL_LOCALE (see duplocale(3))
   or is not a valid locale object handle.

   The  argument  wc  must  be  representable  as a wchar_t and be a valid
   character in the locale or be the value WEOF.

RETURN VALUE

   If wc was convertible to lowercase, towlower()  returns  its  lowercase
   equivalent; otherwise it returns wc.

VERSIONS

   The towlower_l() function first appeared in glibc 2.3.

ATTRIBUTES

   For   an   explanation   of   the  terms  used  in  this  section,  see
   attributes(7).

   
   Interface     Attribute      Value          
   
   towlower()    Thread safety  MT-Safe locale 
   
   towlower_l()  Thread safety  MT-Safe

CONFORMING TO

   towlower(): C99, POSIX.1-2001 (XSI); present as  an  XSI  extension  in
   POSIX.1-2008, but marked obsolete.

   towlower_l(): POSIX.1-2008.

NOTES

   The behavior of these functions depends on the LC_CTYPE category of the
   locale.

   These functions are not  very  appropriate  for  dealing  with  Unicode
   characters,  because  Unicode knows about three cases: upper, lower and
   title case.

SEE ALSO

   iswlower(3), towctrans(3), towupper(3), locale(7)

COLOPHON

   This page is part of release 4.09 of the Linux  man-pages  project.   A
   description  of  the project, information about reporting bugs, and the
   latest    version    of    this    page,    can     be     found     at
   https://www.kernel.org/doc/man-pages/.



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